Ajani, Mythic Lion

+5: Discard 5 cards then pick any card out of your deck
-2: Put 1/1 on each creature you control and turn Ajani, Mythic Lion into a 10/10 creature
-15: Kill every living thing on the battlefield, do 15 damage to each opponent, draw 15 cards, give them all haste and lifelink, then place them down